Signshine S3121 GPRS Modem is a kind of cellular terminal device with RS232 that provides SMS, dial-up and CSD function by public GPRS network.

It adopts high-powered industrial cellular module and supports RS232 port that can conveniently connect one device to a cellular network, allowing you to connect to your existing serial device.

This product has been widely used in M2M/SCADA field,such as power automation, transportation, financial service terminal, factory automation, water, oil&gas, large machine maintenance, environment, building automation, outdoor digital signage ect.